Bonito is called Katsuo in Japan. Bonito fish is dried, and it becomes famously Katsuo bushi = Bonito flakes

This bonito flakes make dashi with Konbu

Raw Konbu

Dried Konbu Which is used to make dashi

1 piece of konbu ( 10cm) for over nite in 1 litre of wate, and heat it to just before the boiling point, and remove konbu, and turn off the heat, and add 20grm of Bonito flakes, andwait until all the bonito flakes sink at the bottom, and use seeve 7 mosli cloth to squeeze the dashi.